Fetch logged in user in BPM worklist through ADF

We have a requirement to fetch logged in user in BPM worklist and make some fields of ADF form attached with Human task to disable.

Here is the code which might be useful :

                String userId = "";
                ITaskQueryService queryService;
                IWorkflowServiceClient wfSvcClient;
                IWorkflowContext wfContext;
                String contextStr = ADFWorklistBeanUtil.getWorklistContextId();
                // wfSvcClient = WorkflowServiceClientFactory.getWorkflowServiceClient(WorkflowServiceClientFactory.REMOTE_CLIENT);
                wfSvcClient =
                        oracle.bpel.services.workflow.client.WorkflowServiceClientFactory.getWorkflowServiceClient(WorkflowServiceClientFactory.REMOTE_CLIENT);
                queryService = wfSvcClient.getTaskQueryService();
                wfContext = queryService.getWorkflowContext(contextStr);
                userId = wfContext.getUser();
                logger.info("Current logged in User is  " + userId);